341   def index( tree, map = {} )  argument
350   def find( tree, what )  argument
359   def find_token_type( tree, type )  argument
365   def find_pattern( tree, pattern )  argument
371   def visit( tree, what = nil, &block )  argument
386   def visit_all( tree, parent = nil, &block )  argument
394   def visit_type( tree, parent, type, &block )  argument
403   def visit_pattern( tree, pattern, &block )  argument
416   def match( tree, pattern )  argument
422   def match!( tree, pattern, labels = {} )  argument
466   def in_context?( tree, context )  argument